线程中join简单使用

暂停线程的执行，直到调用该方法的线程执行结束为止。可以使用join等待另一个thread对象结束

在多个线程中，我们需要保证某个线程执行之前先把另外的线程先执行了，这里我们可以使用join方法，下面给出案例效果图

代码部分

package com.java.thread.test;
 
/**
 * @Description:
 * @Author: qiuxie
 * @Create: 2023/8/9 21:49
 */
public class JoinThread {
 
    public static class Goddess implements Runnable{
 
        private Thread thread;
 
        public void setThread(Thread thread) {
            this.thread = thread;
        }
 
        public Goddess(Thread thread) {
            this.thread = thread;
        }
 
        public Goddess() {
 
        }
 
        @Override
        public void run() {
            System.out.println("女神开始排队打饭");
            try {
                if (thread!=null){
                    thread.join();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("女神打饭完成....");
        }
    }
 
    public static class GoddessBoyfriend implements Runnable{
        @Override
        public void run() {
            System.out.println("女神男朋友开始打饭");
            System.out.println("女神男朋友打饭完成");
 
        }
    }
 
    public static void main(String[] args) throws InterruptedException {
        GoddessBoyfriend boyfriend = new GoddessBoyfriend();
        Thread gbf = new Thread(boyfriend);
        Goddess goddess = new Goddess(gbf);
        Thread thread = new Thread(goddess);
        thread.start();
        gbf.start();
        System.out.println("备胎开始排队打饭....");
        thread.join();
        System.out.println("备胎打饭完成....");
 
    }
 
}

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.java</groupId>
    <artifactId>web-study</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>web-study</name>
    <description>Demo project for Spring Boot</description>
 
    <properties>
        <java.version>1.8</java.version>
    </properties>
 
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
 
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.28</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--ThreadFactoryBuilder的依赖包,多线程使用-->
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>30.1-jre</version>
        </dependency>
        <!--引入junit单元测试依赖-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
 
        <!--lombok依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
        </dependency>
 
        <!--添加fastjson依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <!--<version>1.2.7</version>-->
            <version>1.2.70</version>
        </dependency>
 
        <dependency>
            <groupId>co.paralleluniverse</groupId>
            <artifactId>quasar-core</artifactId>
            <version>0.7.9</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.9</version>
        </dependency>
    </dependencies>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
 
    </build>
 
</project>